71660647 has 8 divisors (see below), whose sum is σ = 75518000. Its totient is φ = 67811904.

The previous prime is 71660629. The next prime is 71660651. The reversal of 71660647 is 74606617.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71660647 - 2¹¹ = 71658599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71660657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21979 + ... + 25027.

It is an arithmetic number, because the mean of its divisors is an integer number (9439750).

Almost surely, 2^71660647 is an apocalyptic number.

71660647 is a deficient number, since it is larger than the sum of its proper divisors (3857353).

71660647 is a wasteful number, since it uses less digits than its factorization.

71660647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4305.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 71660647 is about 8465.2611891187. The cubic root of 71660647 is about 415.3621399846.

The spelling of 71660647 in words is "seventy-one million, six hundred sixty thousand, six hundred forty-seven".